1. Department of Mathematics, Turabah University College, Taif University, Taif, Saudi Arabia
2. Department of Statistics, College of Administration and Economics, Salahaddin University-Erbil, Erbil, F.R. Iraq
3. Department of Business Administration, Cihan University-Erbil, Erbil, Iraq
4. Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, Johor, Malaysia
5. Department of Chemistry, Faculty of Science, Sana’a University, Sana’a, Yemen
6. Department of Statistics and Informatics, University of Mosul, Mosul, Iraq
7. Department of Operations Research and Intelligent Techniques, University of Mosul, Mosul, Iraq
8. Department of General Science, University of Mosul, Mosul, Iraq